Of the 1000 inhabitants of a town, 60% are males of whom 20% are literate. If, of all the inhabitants, 25% are literate-then what percent of the females of the town are literate?

Of the 1000 inhabitants of a town, 60% are males of whom 20% are literate.
So, Males is 600. And Females will be 400. 
20% of males are literate, 20% of 600 will be 120. So 120 males are literate and 480 females are illiterate. 

If overall 25% are literate. Total literate people will be 250. 
Out of this we are told 120 are male, so 130 will be female. 

130 females out of 400 are literate. 
$$\frac{130}{400}\times100=32.5\%$$